A new procedure for obtaining intensive intensive synthetic curtients (Machine-translation by Google Translate, not legally binding)

摘要

A new procedure for obtaining synthetic intensive-action tanning agents characterized in that, as a first step, the condensation of tar-derived compounds is effected by means of formaldehyde, after the pre-existing formed water is eliminated, the sulfonation of the product obtained by means of sulfuric acid or, possibly, chlorosulfonic acid and the operation being finished by a neutralization with caustic soda or sodium carbonate until the final product is left at a predetermined ph according to the applications to which it is subsequently destined. (Machine-translation by Google Translate, not legally binding)